lanthanum

[n] - a white soft metallic element that tarnishes readily
Found on http://www.webdictionary.co.uk/definition.php?query=lanthanum

lanthanum

<chemical> Lanthanum salts are used as a negative stain in electron microscopy and as calcium channel blockers. ... (18 Nov 1997) ...
Found on http://www.encyclo.co.uk/local/20973

lanthanum

La noun a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
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Lanthanum

Lanthanum is a rare metal lanthanide element with the symbol La. It was discovered in the oxide of cerium by Mosander in 1839.
Found on http://www.probertencyclopaedia.com/browse/GL.HTM
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